Mental emotional disorder or psychological distress is one of disaster effect. The COVID-19 pandemic is considered as the most crucial global health calamity of the century and the greatest challenge that the humankind faced since the 2nd World War (Indranil Chakraborty, 2020). The study design was an action research with pre-post test evaluation. The aim of this research was to describe the emotional condition during the Covid-19 pandemic and to see the effect of Psychosocial Support Program of Indonesian Redcross with online based psychoeducation on the increasing of participants' knowledge about stress management. The sample was taken using accidental sampling which are the participants of the National Webinar held by Indonesian Red Cross Volunteer_IPB Unit  on October 31, 2020. There were 140  subject, 85% female with 57% less than 20 years follow the program. The instrument used was Self Reporting Questionnaire-20 (SRQ-20) to get a picture of mental emotional disorders. From the results of data processing with SPSS version 24, it was found that 85 people (60.7%) experienced mental emotional disorders and 55 people (39.3%) did not experience mental emotional disorders. This is in line with WHO (2020) which states that the Covid-19 pandemic has caused distress to society. The result of  Wilcoxon  anylisis  shows that asymp.Sig (2-tailed) is 0.00 less than 0.05, so it can be concluded that there is an effect of PMI's Psychosocial Support Program with  online-based psychoeducation on increasing knowledge about stress management of the participant.